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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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A crystal's internal structure is an orderly array of atoms, ions, or molecules, and the details of this array significantly influence the solid's properties. In a crystal, periodically repeating 'structural motifs' - which could be atoms, molecules, or groups thereof - create a 'space lattice.' This is essentially a three-dimensional, infinite array of points, each surrounded by its neighbors in an identical way, forming the basic structure of the crystal.A 'unit cell' is a theoretical...
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 Every plant cell has a cell wall that protects the cell, provides structural support, and gives the cell shape. Cellulose, the main structural component of the plant cell wall, makes up over 30% of plant matter. It is the most abundant organic compound on earth.  Cellulose is an unbranched polysaccharide composed of linear chains of glucose molecules linked by β (1→4) glycosidic bonds.
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Two-Dimensional Aggregation and Semidilute Ordering in Cellulose Nanocrystals.

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Carboxymethylated cellulose nanocrystals (CNC-COOH) form stable 2D aggregates, similar to CNC-SO3H, showing early liquid crystalline ordering in solution. These findings are crucial for developing advanced nanomaterials.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomaterials

Background:

  • Cellulose nanocrystals (CNCs) are derived from cellulose, a renewable biopolymer.
  • Surface functionalization influences CNC properties and assembly.
  • Carboxymethylation and sulfation are common methods to modify CNCs.

Purpose of the Study:

  • To investigate the structural properties and aggregation behavior of carboxymethylated cellulose nanocrystals (CNC-COOH).
  • To compare CNC-COOH with sulfuric acid hydrolyzed cellulose nanocrystals (CNC-SO3H).
  • To understand the early stages of liquid crystalline ordering in CNC systems.

Main Methods:

  • Small Angle Neutron Scattering (SANS)
  • Transmission Electron Microscopy (TEM)
  • Atomic Force Microscopy (AFM)
  • Dynamic Light Scattering (DLS)

Main Results:

  • CNC-COOH forms stable 2D aggregates in solution and on surfaces.
  • CNC-SO3H exhibits similar 2D aggregate dimensions but shorter lengths compared to CNC-COOH.
  • Both CNC-COOH and CNC-SO3H show reversible ordering and a structure peak in semidilute conditions, indicating early liquid crystalline behavior.

Conclusions:

  • Carboxymethylation leads to stable 2D CNC aggregates with potential for ordered structures.
  • The observed ordering occurs at lower concentrations than previously detected by optical methods.
  • These findings advance the understanding of CNC assembly for advanced material applications.